钢管混凝土拱桥模型的理论和试验模态分析  

Experimental and analytical model analysis of a concrete-filled steel tubular arch bridge modal

作　　者：潘晓杰[1] 谢慧才[1] 程林[1] 李洋[1] 

机构地区：[1]深圳大学土木工程学院深圳市土木工程耐久性重点实验室,广东深圳518060

出　　处：《四川建筑科学研究》2008年第5期66-70,共5页Sichuan Building Science

基　　金：国家自然科学基金资助项目(50678099)

摘　　要：在环境激励条件下,仅用测得的输出响应识别结构的模态参数越来越受到重视。首先,用自然激励技术和特征系统实现算法对一个悬臂槽钢进行了模态参数识别,并与已知的有限元结果进行了比较,吻合较好,从而证明了该模态识别技术和所使用的整套仪器的可信度;然后,用该方法对一个较复杂的钢管混凝土拱桥模型进行了模态参数识别,并与ANSYS建立的有限元模型进行了比较,指出了有限元建模过程的误差和需要改进的地方。It is more and more recognition to identify the modal parameter uses output-only dynamic response in ambient vibration. NEXT and ERA have been used to identify the modal parameter of the cantilever groovy steel beam in this paper, which used in ambient vibration. Results between experimental and analytical modal analysis have been compared and show a good agreement. Which prove that this modal identification method and the equipments used in this experiment is believable. Then, take this used on a complex concrete-fined steel tubular arch bridge modal, and compare it to the 3-Dfinite element model. Results indicated that there is error in the process of the model set up and needs model updating.

关 键 词：模态参数 自然激励技术 特征系统实现算法 

分 类 号：TU392.3[建筑科学—结构工程]